Net climate-change-related increases in the geographic distribution (altitude and latitude) of the vector organisms of infectious diseases (e.g., malarial mosquitoes, schistosome-spreading snails) and changes in the life-cycle dynamics of both vector and infective parasites would, in aggregate, increase the potential transmission of many vector-borne diseases ...

For example, schistosome eggs have a latency of a few weeks during which time they develop in an intermediate host into the infective, free swimming cercariae (Fig. 2.2); however, both the eggs and the cercariae have a persistence of only a few hours if they do not enter a new host

For example, schistosome eggs have a latency of a few weeks during which time they develop in an intermediate host into the infective, free-swimming cercariae (Fig. 2.2); however, both the eggs and the cercariae have a persistence of only a few hours if they do not enter a new host